Crossword Genius

Forceful flick, using the other hand (4)

Ross

I believe the answer is:

firm

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'forceful' is the definition.
(similar in meaning)

I cannot understand how the rest of the clue works.

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(Other definitions for firm that I've seen before include "Unflinching" , "Solid; secure" , "Steadfast" , "Company - stable" , "Stable; business" .)

I've seen this clue in The Guardian.
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